dlls/ntdll/path.c

   1 /*
   2  * Ntdll path functions
   3  *
   4  * Copyright 2002, 2003, 2004 Alexandre Julliard
   5  * Copyright 2003 Eric Pouech
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include <stdarg.h>
  23 #include <sys/types.h>
  24
  25 #include "ntstatus.h"
  26 #define WIN32_NO_STATUS
  27 #include "windef.h"
  28 #include "winioctl.h"
  29 #include "wine/debug.h"
  30 #include "ntdll_misc.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(file);
  33
  34 #define IS_SEPARATOR(ch)  ((ch) == '\\' || (ch) == '/')
  35
  36 /***********************************************************************
  37  *             RtlDetermineDosPathNameType_U   (NTDLL.@)
  38  */
  39 DOS_PATHNAME_TYPE WINAPI RtlDetermineDosPathNameType_U( PCWSTR path )
  40 {
  41     if (IS_SEPARATOR(path[0]))
  42     {
  43         if (!IS_SEPARATOR(path[1])) return ABSOLUTE_PATH;       /* "/foo" */
  44         if (path[2] != '.' && path[2] != '?') return UNC_PATH;  /* "//foo" */
  45         if (IS_SEPARATOR(path[3])) return DEVICE_PATH;          /* "//./foo" or "//?/foo" */
  46         if (path[3]) return UNC_PATH;                           /* "//.foo" or "//?foo" */
  47         return UNC_DOT_PATH;                                    /* "//." or "//?" */
  48     }
  49     else
  50     {
  51         if (!path[0] || path[1] != ':') return RELATIVE_PATH;   /* "foo" */
  52         if (IS_SEPARATOR(path[2])) return ABSOLUTE_DRIVE_PATH;  /* "c:/foo" */
  53         return RELATIVE_DRIVE_PATH;                             /* "c:foo" */
  54     }
  55 }
  56
  57 /***********************************************************************
  58  *             RtlIsDosDeviceName_U   (NTDLL.@)
  59  *
  60  * Check if the given DOS path contains a DOS device name.
  61  *
  62  * Returns the length of the device name in the low word and its
  63  * position in the high word (both in bytes, not WCHARs), or 0 if no
  64  * device name is found.
  65  */
  66 ULONG WINAPI RtlIsDosDeviceName_U( PCWSTR dos_name )
  67 {
  68     static const WCHAR auxW[] = {'A','U','X'};
  69     static const WCHAR comW[] = {'C','O','M'};
  70     static const WCHAR conW[] = {'C','O','N'};
  71     static const WCHAR lptW[] = {'L','P','T'};
  72     static const WCHAR nulW[] = {'N','U','L'};
  73     static const WCHAR prnW[] = {'P','R','N'};
  74     static const WCHAR coninW[]  = {'C','O','N','I','N','$'};
  75     static const WCHAR conoutW[] = {'C','O','N','O','U','T','$'};
  76
  77     const WCHAR *start, *end, *p;
  78
  79     switch(RtlDetermineDosPathNameType_U( dos_name ))
  80     {
  81     case INVALID_PATH:
  82     case UNC_PATH:
  83         return 0;
  84     case DEVICE_PATH:
  85         if (!wcsicmp( dos_name, L"\\\\.\\CON" ))
  86             return MAKELONG( sizeof(conW), 4 * sizeof(WCHAR) );  /* 4 is length of \\.\ prefix */
  87         return 0;
  88     case ABSOLUTE_DRIVE_PATH:
  89     case RELATIVE_DRIVE_PATH:
  90         start = dos_name + 2;  /* skip drive letter */
  91         break;
  92     default:
  93         start = dos_name;
  94         break;
  95     }
  96
  97     /* find start of file name */
  98     for (p = start; *p; p++) if (IS_SEPARATOR(*p)) start = p + 1;
  99
 100     /* truncate at extension and ':' */
 101     for (end = start; *end; end++) if (*end == '.' || *end == ':') break;
 102     end--;
 103
 104     /* remove trailing spaces */
 105     while (end >= start && *end == ' ') end--;
 106
 107     /* now we have a potential device name between start and end, check it */
 108     switch(end - start + 1)
 109     {
 110     case 3:
 111         if (wcsnicmp( start, auxW, 3 ) &&
 112             wcsnicmp( start, conW, 3 ) &&
 113             wcsnicmp( start, nulW, 3 ) &&
 114             wcsnicmp( start, prnW, 3 )) break;
 115         return MAKELONG( 3 * sizeof(WCHAR), (start - dos_name) * sizeof(WCHAR) );
 116     case 4:
 117         if (wcsnicmp( start, comW, 3 ) && wcsnicmp( start, lptW, 3 )) break;
 118         if (*end <= '0' || *end > '9') break;
 119         return MAKELONG( 4 * sizeof(WCHAR), (start - dos_name) * sizeof(WCHAR) );
 120     case 6:
 121         if (wcsnicmp( start, coninW, ARRAY_SIZE(coninW) )) break;
 122         return MAKELONG( sizeof(coninW), (start - dos_name) * sizeof(WCHAR) );
 123     case 7:
 124         if (wcsnicmp( start, conoutW, ARRAY_SIZE(conoutW) )) break;
 125         return MAKELONG( sizeof(conoutW), (start - dos_name) * sizeof(WCHAR) );
 126     default:  /* can't match anything */
 127         break;
 128     }
 129     return 0;
 130 }
 131
 132 /******************************************************************
 133  *              is_valid_directory
 134  *
 135  * Helper for RtlDosPathNameToNtPathName_U_WithStatus.
 136  * Test if the path is an existing directory.
 137  */
 138 static BOOL is_valid_directory(LPCWSTR path)
 139 {
 140     OBJECT_ATTRIBUTES attr;
 141     UNICODE_STRING ntpath;
 142     IO_STATUS_BLOCK io;
 143     HANDLE handle;
 144     NTSTATUS nts;
 145
 146     if (!RtlDosPathNameToNtPathName_U(path, &ntpath, NULL, NULL))
 147         return FALSE;
 148
 149     attr.Length = sizeof(attr);
 150     attr.RootDirectory = 0;
 151     attr.Attributes = OBJ_CASE_INSENSITIVE;
 152     attr.ObjectName = &ntpath;
 153     attr.SecurityDescriptor = NULL;
 154     attr.SecurityQualityOfService = NULL;
 155
 156     nts = NtOpenFile(&handle, FILE_READ_ATTRIBUTES | SYNCHRONIZE, &attr, &io,
 157                      FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
 158                      FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT);
 159     RtlFreeUnicodeString(&ntpath);
 160     if (nts != STATUS_SUCCESS)
 161         return FALSE;
 162     NtClose(handle);
 163     return TRUE;
 164 }
 165
 166 /**************************************************************************
 167  *                 RtlDosPathNameToNtPathName_U_WithStatus    [NTDLL.@]
 168  *
 169  * dos_path: a DOS path name (fully qualified or not)
 170  * ntpath:   pointer to a UNICODE_STRING to hold the converted
 171  *           path name
 172  * file_part:will point (in ntpath) to the file part in the path
 173  * cd:       directory reference (optional)
 174  *
 175  * FIXME:
 176  *      + fill the cd structure
 177  */
 178 NTSTATUS WINAPI RtlDosPathNameToNtPathName_U_WithStatus(const WCHAR *dos_path, UNICODE_STRING *ntpath,
 179     WCHAR **file_part, CURDIR *cd)
 180 {
 181     static const WCHAR global_prefix[] = {'\\','\\','?','\\'};
 182     static const WCHAR global_prefix2[] = {'\\','?','?','\\'};
 183     NTSTATUS nts = STATUS_SUCCESS;
 184     ULONG sz, offset, dosdev;
 185     WCHAR local[MAX_PATH];
 186     LPWSTR ptr = local;
 187
 188     TRACE("(%s,%p,%p,%p)\n", debugstr_w(dos_path), ntpath, file_part, cd);
 189
 190     if (cd)
 191     {
 192         FIXME("Unsupported parameter\n");
 193         memset(cd, 0, sizeof(*cd));
 194     }
 195
 196     if (!dos_path || !*dos_path)
 197         return STATUS_OBJECT_NAME_INVALID;
 198
 199     if (!memcmp(dos_path, global_prefix, sizeof(global_prefix)) ||
 200         (!memcmp(dos_path, global_prefix2, sizeof(global_prefix2)) && dos_path[4]) ||
 201         !wcsicmp( dos_path, L"\\\\.\\CON" ))
 202     {
 203         ntpath->Length = wcslen(dos_path) * sizeof(WCHAR);
 204         ntpath->MaximumLength = ntpath->Length + sizeof(WCHAR);
 205         ntpath->Buffer = RtlAllocateHeap(GetProcessHeap(), 0, ntpath->MaximumLength);
 206         if (!ntpath->Buffer) return STATUS_NO_MEMORY;
 207         memcpy( ntpath->Buffer, dos_path, ntpath->MaximumLength );
 208         ntpath->Buffer[1] = '?';  /* change \\?\ to \??\ */
 209         ntpath->Buffer[2] = '?';
 210         if (file_part)
 211         {
 212             if ((ptr = wcsrchr( ntpath->Buffer, '\\' )) && ptr[1]) *file_part = ptr + 1;
 213             else *file_part = NULL;
 214         }
 215         return STATUS_SUCCESS;
 216     }
 217
 218     dosdev = RtlIsDosDeviceName_U(dos_path);
 219     if ((offset = HIWORD(dosdev)))
 220     {
 221         sz = offset + sizeof(WCHAR);
 222
 223         if (sz > sizeof(local) &&
 224             (!(ptr = RtlAllocateHeap(GetProcessHeap(), 0, sz))))
 225             return STATUS_NO_MEMORY;
 226
 227         memcpy(ptr, dos_path, offset);
 228         ptr[offset/sizeof(WCHAR)] = '\0';
 229
 230         if (!is_valid_directory(ptr))
 231         {
 232             nts = STATUS_OBJECT_NAME_INVALID;
 233             goto out;
 234         }
 235
 236         if (file_part) *file_part = NULL;
 237
 238         sz = LOWORD(dosdev);
 239
 240         wcscpy(ptr, L"\\\\.\\");
 241         memcpy(ptr + 4, dos_path + offset / sizeof(WCHAR), sz);
 242         ptr[4 + sz / sizeof(WCHAR)] = '\0';
 243         sz += 4 * sizeof(WCHAR);
 244     }
 245     else
 246     {
 247         sz = RtlGetFullPathName_U(dos_path, sizeof(local), ptr, file_part);
 248         if (sz == 0) return STATUS_OBJECT_NAME_INVALID;
 249
 250         if (sz > sizeof(local))
 251         {
 252             if (!(ptr = RtlAllocateHeap(GetProcessHeap(), 0, sz))) return STATUS_NO_MEMORY;
 253             sz = RtlGetFullPathName_U(dos_path, sz, ptr, file_part);
 254         }
 255     }
 256     sz += (1 /* NUL */ + 4 /* unc\ */ + 4 /* \??\ */) * sizeof(WCHAR);
 257     if (sz > MAXWORD)
 258     {
 259         nts = STATUS_OBJECT_NAME_INVALID;
 260         goto out;
 261     }
 262
 263     ntpath->MaximumLength = sz;
 264     ntpath->Buffer = RtlAllocateHeap(GetProcessHeap(), 0, ntpath->MaximumLength);
 265     if (!ntpath->Buffer)
 266     {
 267         nts = STATUS_NO_MEMORY;
 268         goto out;
 269     }
 270
 271     wcscpy(ntpath->Buffer, L"\\??\\");
 272     switch (RtlDetermineDosPathNameType_U(ptr))
 273     {
 274     case UNC_PATH: /* \\foo */
 275         offset = 2;
 276         wcscat(ntpath->Buffer, L"UNC\\");
 277         break;
 278     case DEVICE_PATH: /* \\.\foo */
 279         offset = 4;
 280         break;
 281     default:
 282         offset = 0;
 283         break;
 284     }
 285
 286     wcscat(ntpath->Buffer, ptr + offset);
 287     ntpath->Length = wcslen(ntpath->Buffer) * sizeof(WCHAR);
 288
 289     if (file_part && *file_part)
 290         *file_part = ntpath->Buffer + ntpath->Length / sizeof(WCHAR) - wcslen(*file_part);
 291
 292     /* FIXME: cd filling */
 293
 294 out:
 295     if (ptr != local) RtlFreeHeap(GetProcessHeap(), 0, ptr);
 296     return nts;
 297 }
 298
 299 /**************************************************************************
 300  *                 RtlDosPathNameToNtPathName_U    [NTDLL.@]
 301  *
 302  * See RtlDosPathNameToNtPathName_U_WithStatus
 303  */
 304 BOOLEAN  WINAPI RtlDosPathNameToNtPathName_U(PCWSTR dos_path,
 305                                              PUNICODE_STRING ntpath,
 306                                              PWSTR* file_part,
 307                                              CURDIR* cd)
 308 {
 309     return RtlDosPathNameToNtPathName_U_WithStatus(dos_path, ntpath, file_part, cd) == STATUS_SUCCESS;
 310 }
 311
 312 /**************************************************************************
 313  *        RtlDosPathNameToRelativeNtPathName_U_WithStatus [NTDLL.@]
 314  *
 315  * See RtlDosPathNameToNtPathName_U_WithStatus (except the last parameter)
 316  */
 317 NTSTATUS WINAPI RtlDosPathNameToRelativeNtPathName_U_WithStatus(const WCHAR *dos_path,
 318     UNICODE_STRING *ntpath, WCHAR **file_part, RTL_RELATIVE_NAME *relative)
 319 {
 320     TRACE("(%s,%p,%p,%p)\n", debugstr_w(dos_path), ntpath, file_part, relative);
 321
 322     if (relative)
 323     {
 324         FIXME("Unsupported parameter\n");
 325         memset(relative, 0, sizeof(*relative));
 326     }
 327
 328     /* FIXME: fill parameter relative */
 329
 330     return RtlDosPathNameToNtPathName_U_WithStatus(dos_path, ntpath, file_part, NULL);
 331 }
 332
 333 /**************************************************************************
 334  *        RtlReleaseRelativeName [NTDLL.@]
 335  */
 336 void WINAPI RtlReleaseRelativeName(RTL_RELATIVE_NAME *relative)
 337 {
 338 }
 339
 340 /******************************************************************
 341  *              RtlDosSearchPath_U
 342  *
 343  * Searches a file of name 'name' into a ';' separated list of paths
 344  * (stored in paths)
 345  * Doesn't seem to search elsewhere than the paths list
 346  * Stores the result in buffer (file_part will point to the position
 347  * of the file name in the buffer)
 348  * FIXME:
 349  * - how long shall the paths be ??? (MAX_PATH or larger with \\?\ constructs ???)
 350  */
 351 ULONG WINAPI RtlDosSearchPath_U(LPCWSTR paths, LPCWSTR search, LPCWSTR ext,
 352                                 ULONG buffer_size, LPWSTR buffer,
 353                                 LPWSTR* file_part)
 354 {
 355     DOS_PATHNAME_TYPE type = RtlDetermineDosPathNameType_U(search);
 356     ULONG len = 0;
 357
 358     if (type == RELATIVE_PATH)
 359     {
 360         ULONG allocated = 0, needed, filelen;
 361         WCHAR *name = NULL;
 362
 363         filelen = 1 /* for \ */ + wcslen(search) + 1 /* \0 */;
 364
 365         /* Windows only checks for '.' without worrying about path components */
 366         if (wcschr( search, '.' )) ext = NULL;
 367         if (ext != NULL) filelen += wcslen(ext);
 368
 369         while (*paths)
 370         {
 371             LPCWSTR ptr;
 372
 373             for (needed = 0, ptr = paths; *ptr != 0 && *ptr++ != ';'; needed++);
 374             if (needed + filelen > allocated)
 375             {
 376                 if (!name) name = RtlAllocateHeap(GetProcessHeap(), 0,
 377                                                   (needed + filelen) * sizeof(WCHAR));
 378                 else
 379                 {
 380                     WCHAR *newname = RtlReAllocateHeap(GetProcessHeap(), 0, name,
 381                                                        (needed + filelen) * sizeof(WCHAR));
 382                     if (!newname) RtlFreeHeap(GetProcessHeap(), 0, name);
 383                     name = newname;
 384                 }
 385                 if (!name) return 0;
 386                 allocated = needed + filelen;
 387             }
 388             memmove(name, paths, needed * sizeof(WCHAR));
 389             /* append '\\' if none is present */
 390             if (needed > 0 && name[needed - 1] != '\\') name[needed++] = '\\';
 391             wcscpy(&name[needed], search);
 392             if (ext) wcscat(&name[needed], ext);
 393             if (RtlDoesFileExists_U(name))
 394             {
 395                 len = RtlGetFullPathName_U(name, buffer_size, buffer, file_part);
 396                 break;
 397             }
 398             paths = ptr;
 399         }
 400         RtlFreeHeap(GetProcessHeap(), 0, name);
 401     }
 402     else if (RtlDoesFileExists_U(search))
 403     {
 404         len = RtlGetFullPathName_U(search, buffer_size, buffer, file_part);
 405     }
 406
 407     return len;
 408 }
 409
 410
 411 /******************************************************************
 412  *              collapse_path
 413  *
 414  * Helper for RtlGetFullPathName_U.
 415  * Get rid of . and .. components in the path.
 416  */
 417 static inline void collapse_path( WCHAR *path, UINT mark )
 418 {
 419     WCHAR *p, *next;
 420
 421     /* convert every / into a \ */
 422     for (p = path; *p; p++) if (*p == '/') *p = '\\';
 423
 424     /* collapse duplicate backslashes */
 425     next = path + max( 1, mark );
 426     for (p = next; *p; p++) if (*p != '\\' || next[-1] != '\\') *next++ = *p;
 427     *next = 0;
 428
 429     p = path + mark;
 430     while (*p)
 431     {
 432         if (*p == '.')
 433         {
 434             switch(p[1])
 435             {
 436             case '\\': /* .\ component */
 437                 next = p + 2;
 438                 memmove( p, next, (wcslen(next) + 1) * sizeof(WCHAR) );
 439                 continue;
 440             case 0:  /* final . */
 441                 if (p > path + mark) p--;
 442                 *p = 0;
 443                 continue;
 444             case '.':
 445                 if (p[2] == '\\')  /* ..\ component */
 446                 {
 447                     next = p + 3;
 448                     if (p > path + mark)
 449                     {
 450                         p--;
 451                         while (p > path + mark && p[-1] != '\\') p--;
 452                     }
 453                     memmove( p, next, (wcslen(next) + 1) * sizeof(WCHAR) );
 454                     continue;
 455                 }
 456                 else if (!p[2])  /* final .. */
 457                 {
 458                     if (p > path + mark)
 459                     {
 460                         p--;
 461                         while (p > path + mark && p[-1] != '\\') p--;
 462                         if (p > path + mark) p--;
 463                     }
 464                     *p = 0;
 465                     continue;
 466                 }
 467                 break;
 468             }
 469         }
 470         /* skip to the next component */
 471         while (*p && *p != '\\') p++;
 472         if (*p == '\\')
 473         {
 474             /* remove last dot in previous dir name */
 475             if (p > path + mark && p[-1] == '.') memmove( p-1, p, (wcslen(p) + 1) * sizeof(WCHAR) );
 476             else p++;
 477         }
 478     }
 479
 480     /* remove trailing spaces and dots (yes, Windows really does that, don't ask) */
 481     while (p > path + mark && (p[-1] == ' ' || p[-1] == '.')) p--;
 482     *p = 0;
 483 }
 484
 485
 486 /******************************************************************
 487  *              skip_unc_prefix
 488  *
 489  * Skip the \\share\dir\ part of a file name. Helper for RtlGetFullPathName_U.
 490  */
 491 static const WCHAR *skip_unc_prefix( const WCHAR *ptr )
 492 {
 493     ptr += 2;
 494     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* share name */
 495     while (IS_SEPARATOR(*ptr)) ptr++;
 496     while (*ptr && !IS_SEPARATOR(*ptr)) ptr++;  /* dir name */
 497     while (IS_SEPARATOR(*ptr)) ptr++;
 498     return ptr;
 499 }
 500
 501
 502 /******************************************************************
 503  *              get_full_path_helper
 504  *
 505  * Helper for RtlGetFullPathName_U
 506  * Note: name and buffer are allowed to point to the same memory spot
 507  */
 508 static ULONG get_full_path_helper(LPCWSTR name, LPWSTR buffer, ULONG size)
 509 {
 510     ULONG                       reqsize = 0, mark = 0, dep = 0, deplen;
 511     LPWSTR                      ins_str = NULL;
 512     LPCWSTR                     ptr;
 513     const UNICODE_STRING*       cd;
 514     WCHAR                       tmp[4];
 515
 516     /* return error if name only consists of spaces */
 517     for (ptr = name; *ptr; ptr++) if (*ptr != ' ') break;
 518     if (!*ptr) return 0;
 519
 520     RtlAcquirePebLock();
 521
 522     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 523         cd = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 524     else
 525         cd = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 526
 527     switch (RtlDetermineDosPathNameType_U(name))
 528     {
 529     case UNC_PATH:              /* \\foo   */
 530         ptr = skip_unc_prefix( name );
 531         mark = (ptr - name);
 532         break;
 533
 534     case DEVICE_PATH:           /* \\.\foo */
 535         mark = 4;
 536         break;
 537
 538     case ABSOLUTE_DRIVE_PATH:   /* c:\foo  */
 539         reqsize = sizeof(WCHAR);
 540         tmp[0] = name[0];
 541         ins_str = tmp;
 542         dep = 1;
 543         mark = 3;
 544         break;
 545
 546     case RELATIVE_DRIVE_PATH:   /* c:foo   */
 547         dep = 2;
 548         if (wcsnicmp( name, cd->Buffer, 2 ))
 549         {
 550             UNICODE_STRING      var, val;
 551
 552             tmp[0] = '=';
 553             tmp[1] = name[0];
 554             tmp[2] = ':';
 555             tmp[3] = '\0';
 556             var.Length = 3 * sizeof(WCHAR);
 557             var.MaximumLength = 4 * sizeof(WCHAR);
 558             var.Buffer = tmp;
 559             val.Length = 0;
 560             val.MaximumLength = size;
 561             val.Buffer = RtlAllocateHeap(GetProcessHeap(), 0, size);
 562
 563             switch (RtlQueryEnvironmentVariable_U(NULL, &var, &val))
 564             {
 565             case STATUS_SUCCESS:
 566                 /* FIXME: Win2k seems to check that the environment variable actually points
 567                  * to an existing directory. If not, root of the drive is used
 568                  * (this seems also to be the only spot in RtlGetFullPathName that the
 569                  * existence of a part of a path is checked)
 570                  */
 571                 /* fall through */
 572             case STATUS_BUFFER_TOO_SMALL:
 573                 reqsize = val.Length + sizeof(WCHAR); /* append trailing '\\' */
 574                 val.Buffer[val.Length / sizeof(WCHAR)] = '\\';
 575                 ins_str = val.Buffer;
 576                 break;
 577             case STATUS_VARIABLE_NOT_FOUND:
 578                 reqsize = 3 * sizeof(WCHAR);
 579                 tmp[0] = name[0];
 580                 tmp[1] = ':';
 581                 tmp[2] = '\\';
 582                 ins_str = tmp;
 583                 RtlFreeHeap(GetProcessHeap(), 0, val.Buffer);
 584                 break;
 585             default:
 586                 ERR("Unsupported status code\n");
 587                 RtlFreeHeap(GetProcessHeap(), 0, val.Buffer);
 588                 break;
 589             }
 590             mark = 3;
 591             break;
 592         }
 593         /* fall through */
 594
 595     case RELATIVE_PATH:         /* foo     */
 596         reqsize = cd->Length;
 597         ins_str = cd->Buffer;
 598         if (cd->Buffer[1] != ':')
 599         {
 600             ptr = skip_unc_prefix( cd->Buffer );
 601             mark = ptr - cd->Buffer;
 602         }
 603         else mark = 3;
 604         break;
 605
 606     case ABSOLUTE_PATH:         /* \xxx    */
 607         if (name[0] == '/')  /* may be a Unix path */
 608         {
 609             char *unix_name;
 610             WCHAR *nt_str;
 611             ULONG buflen;
 612             NTSTATUS status;
 613             UNICODE_STRING str;
 614             OBJECT_ATTRIBUTES attr;
 615
 616             nt_str = RtlAllocateHeap( GetProcessHeap(), 0, (wcslen(name) + 9) * sizeof(WCHAR) );
 617             wcscpy( nt_str, L"\\??\\unix" );
 618             wcscat( nt_str, name );
 619             RtlInitUnicodeString( &str, nt_str );
 620             InitializeObjectAttributes( &attr, &str, 0, 0, NULL );
 621             buflen = 3 * wcslen(name) + 1;
 622             unix_name = RtlAllocateHeap( GetProcessHeap(), 0, buflen );
 623             status = wine_nt_to_unix_file_name( &attr, unix_name, &buflen, FILE_OPEN_IF );
 624             if (!status || status == STATUS_NO_SUCH_FILE)
 625             {
 626                 buflen = wcslen(name) + 9;
 627                 status = wine_unix_to_nt_file_name( unix_name, nt_str, &buflen );
 628             }
 629             RtlFreeHeap( GetProcessHeap(), 0, unix_name );
 630             if (!status && buflen > 6 && nt_str[5] == ':')
 631             {
 632                 reqsize = (buflen - 4) * sizeof(WCHAR);
 633                 if (reqsize <= size)
 634                 {
 635                     memcpy( buffer, nt_str + 4, reqsize );
 636                     collapse_path( buffer, 3 );
 637                     reqsize -= sizeof(WCHAR);
 638                 }
 639                 RtlFreeHeap( GetProcessHeap(), 0, nt_str );
 640                 goto done;
 641             }
 642             RtlFreeHeap( GetProcessHeap(), 0, nt_str );
 643         }
 644         if (cd->Buffer[1] == ':')
 645         {
 646             reqsize = 2 * sizeof(WCHAR);
 647             tmp[0] = cd->Buffer[0];
 648             tmp[1] = ':';
 649             ins_str = tmp;
 650             mark = 3;
 651         }
 652         else
 653         {
 654             ptr = skip_unc_prefix( cd->Buffer );
 655             reqsize = (ptr - cd->Buffer) * sizeof(WCHAR);
 656             mark = reqsize / sizeof(WCHAR);
 657             ins_str = cd->Buffer;
 658         }
 659         break;
 660
 661     case UNC_DOT_PATH:         /* \\.     */
 662         reqsize = 4 * sizeof(WCHAR);
 663         dep = 3;
 664         tmp[0] = '\\';
 665         tmp[1] = '\\';
 666         tmp[2] = '.';
 667         tmp[3] = '\\';
 668         ins_str = tmp;
 669         mark = 4;
 670         break;
 671
 672     case INVALID_PATH:
 673         goto done;
 674     }
 675
 676     /* enough space ? */
 677     deplen = wcslen(name + dep) * sizeof(WCHAR);
 678     if (reqsize + deplen + sizeof(WCHAR) > size)
 679     {
 680         /* not enough space, return need size (including terminating '\0') */
 681         reqsize += deplen + sizeof(WCHAR);
 682         goto done;
 683     }
 684
 685     memmove(buffer + reqsize / sizeof(WCHAR), name + dep, deplen + sizeof(WCHAR));
 686     if (reqsize) memcpy(buffer, ins_str, reqsize);
 687
 688     if (ins_str != tmp && ins_str != cd->Buffer)
 689         RtlFreeHeap(GetProcessHeap(), 0, ins_str);
 690
 691     collapse_path( buffer, mark );
 692     reqsize = wcslen(buffer) * sizeof(WCHAR);
 693
 694 done:
 695     RtlReleasePebLock();
 696     return reqsize;
 697 }
 698
 699 /******************************************************************
 700  *              RtlGetFullPathName_U  (NTDLL.@)
 701  *
 702  * Returns the number of bytes written to buffer (not including the
 703  * terminating NULL) if the function succeeds, or the required number of bytes
 704  * (including the terminating NULL) if the buffer is too small.
 705  *
 706  * file_part will point to the filename part inside buffer (except if we use
 707  * DOS device name, in which case file_in_buf is NULL)
 708  *
 709  */
 710 DWORD WINAPI RtlGetFullPathName_U(const WCHAR* name, ULONG size, WCHAR* buffer,
 711                                   WCHAR** file_part)
 712 {
 713     WCHAR*      ptr;
 714     DWORD       dosdev;
 715     DWORD       reqsize;
 716
 717     TRACE("(%s %u %p %p)\n", debugstr_w(name), size, buffer, file_part);
 718
 719     if (!name || !*name) return 0;
 720
 721     if (file_part) *file_part = NULL;
 722
 723     /* check for DOS device name */
 724     dosdev = RtlIsDosDeviceName_U(name);
 725     if (dosdev)
 726     {
 727         DWORD   offset = HIWORD(dosdev) / sizeof(WCHAR); /* get it in WCHARs, not bytes */
 728         DWORD   sz = LOWORD(dosdev); /* in bytes */
 729
 730         if (8 + sz + 2 > size) return sz + 10;
 731         wcscpy(buffer, L"\\\\.\\");
 732         memmove(buffer + 4, name + offset, sz);
 733         buffer[4 + sz / sizeof(WCHAR)] = '\0';
 734         /* file_part isn't set in this case */
 735         return sz + 8;
 736     }
 737
 738     reqsize = get_full_path_helper(name, buffer, size);
 739     if (!reqsize) return 0;
 740     if (reqsize > size)
 741     {
 742         LPWSTR tmp = RtlAllocateHeap(GetProcessHeap(), 0, reqsize);
 743         reqsize = get_full_path_helper(name, tmp, reqsize);
 744         if (reqsize + sizeof(WCHAR) > size)  /* it may have worked the second time */
 745         {
 746             RtlFreeHeap(GetProcessHeap(), 0, tmp);
 747             return reqsize + sizeof(WCHAR);
 748         }
 749         memcpy( buffer, tmp, reqsize + sizeof(WCHAR) );
 750         RtlFreeHeap(GetProcessHeap(), 0, tmp);
 751     }
 752
 753     /* find file part */
 754     if (file_part && (ptr = wcsrchr(buffer, '\\')) != NULL && ptr >= buffer + 2 && *++ptr)
 755         *file_part = ptr;
 756     return reqsize;
 757 }
 758
 759 /*************************************************************************
 760  * RtlGetLongestNtPathLength    [NTDLL.@]
 761  *
 762  * Get the longest allowed path length
 763  *
 764  * PARAMS
 765  *  None.
 766  *
 767  * RETURNS
 768  *  The longest allowed path length (277 characters under Win2k).
 769  */
 770 DWORD WINAPI RtlGetLongestNtPathLength(void)
 771 {
 772     return MAX_NT_PATH_LENGTH;
 773 }
 774
 775
 776 /******************************************************************
 777  *             RtlDoesFileExists_U   (NTDLL.@)
 778  */
 779 BOOLEAN WINAPI RtlDoesFileExists_U(LPCWSTR file_name)
 780 {
 781     UNICODE_STRING nt_name;
 782     FILE_BASIC_INFORMATION basic_info;
 783     OBJECT_ATTRIBUTES attr;
 784     NTSTATUS status;
 785
 786     if (!RtlDosPathNameToNtPathName_U( file_name, &nt_name, NULL, NULL )) return FALSE;
 787     InitializeObjectAttributes( &attr, &nt_name, OBJ_CASE_INSENSITIVE, 0, NULL );
 788     status = NtQueryAttributesFile(&attr, &basic_info);
 789     RtlFreeUnicodeString( &nt_name );
 790     return !status;
 791 }
 792
 793
 794 /******************************************************************
 795  *             RtlIsNameLegalDOS8Dot3   (NTDLL.@)
 796  *
 797  * Returns TRUE iff unicode is a valid DOS (8+3) name.
 798  * If the name is valid, oem gets filled with the corresponding OEM string
 799  * spaces is set to TRUE if unicode contains spaces
 800  */
 801 BOOLEAN WINAPI RtlIsNameLegalDOS8Dot3( const UNICODE_STRING *unicode,
 802                                        OEM_STRING *oem, BOOLEAN *spaces )
 803 {
 804     static const char illegal[] = "*?<>|\"+=,;[]:/\\\345";
 805     int dot = -1;
 806     int i;
 807     char buffer[12];
 808     OEM_STRING oem_str;
 809     BOOLEAN got_space = FALSE;
 810
 811     if (!oem)
 812     {
 813         oem_str.Length = sizeof(buffer);
 814         oem_str.MaximumLength = sizeof(buffer);
 815         oem_str.Buffer = buffer;
 816         oem = &oem_str;
 817     }
 818     if (RtlUpcaseUnicodeStringToCountedOemString( oem, unicode, FALSE ) != STATUS_SUCCESS)
 819         return FALSE;
 820
 821     if (oem->Length > 12) return FALSE;
 822
 823     /* a starting . is invalid, except for . and .. */
 824     if (oem->Length > 0 && oem->Buffer[0] == '.')
 825     {
 826         if (oem->Length != 1 && (oem->Length != 2 || oem->Buffer[1] != '.')) return FALSE;
 827         if (spaces) *spaces = FALSE;
 828         return TRUE;
 829     }
 830
 831     for (i = 0; i < oem->Length; i++)
 832     {
 833         switch (oem->Buffer[i])
 834         {
 835         case ' ':
 836             /* leading/trailing spaces not allowed */
 837             if (!i || i == oem->Length-1 || oem->Buffer[i+1] == '.') return FALSE;
 838             got_space = TRUE;
 839             break;
 840         case '.':
 841             if (dot != -1) return FALSE;
 842             dot = i;
 843             break;
 844         default:
 845             if (strchr(illegal, oem->Buffer[i])) return FALSE;
 846             break;
 847         }
 848     }
 849     /* check file part is shorter than 8, extension shorter than 3
 850      * dot cannot be last in string
 851      */
 852     if (dot == -1)
 853     {
 854         if (oem->Length > 8) return FALSE;
 855     }
 856     else
 857     {
 858         if (dot > 8 || (oem->Length - dot > 4) || dot == oem->Length - 1) return FALSE;
 859     }
 860     if (spaces) *spaces = got_space;
 861     return TRUE;
 862 }
 863
 864 /******************************************************************
 865  *              RtlGetCurrentDirectory_U (NTDLL.@)
 866  *
 867  */
 868 ULONG WINAPI RtlGetCurrentDirectory_U(ULONG buflen, LPWSTR buf)
 869 {
 870     UNICODE_STRING*     us;
 871     ULONG               len;
 872
 873     TRACE("(%u %p)\n", buflen, buf);
 874
 875     RtlAcquirePebLock();
 876
 877     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 878         us = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir.DosPath;
 879     else
 880         us = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory.DosPath;
 881
 882     len = us->Length / sizeof(WCHAR);
 883     if (us->Buffer[len - 1] == '\\' && us->Buffer[len - 2] != ':')
 884         len--;
 885
 886     if (buflen / sizeof(WCHAR) > len)
 887     {
 888         memcpy(buf, us->Buffer, len * sizeof(WCHAR));
 889         buf[len] = '\0';
 890     }
 891     else
 892     {
 893         len++;
 894     }
 895
 896     RtlReleasePebLock();
 897
 898     return len * sizeof(WCHAR);
 899 }
 900
 901 /******************************************************************
 902  *              RtlSetCurrentDirectory_U (NTDLL.@)
 903  *
 904  */
 905 NTSTATUS WINAPI RtlSetCurrentDirectory_U(const UNICODE_STRING* dir)
 906 {
 907     FILE_FS_DEVICE_INFORMATION device_info;
 908     OBJECT_ATTRIBUTES attr;
 909     UNICODE_STRING newdir;
 910     IO_STATUS_BLOCK io;
 911     CURDIR *curdir;
 912     HANDLE handle;
 913     NTSTATUS nts;
 914     ULONG size;
 915     PWSTR ptr;
 916
 917     newdir.Buffer = NULL;
 918
 919     RtlAcquirePebLock();
 920
 921     if (NtCurrentTeb()->Tib.SubSystemTib)  /* FIXME: hack */
 922         curdir = &((WIN16_SUBSYSTEM_TIB *)NtCurrentTeb()->Tib.SubSystemTib)->curdir;
 923     else
 924         curdir = &NtCurrentTeb()->Peb->ProcessParameters->CurrentDirectory;
 925
 926     if (!RtlDosPathNameToNtPathName_U( dir->Buffer, &newdir, NULL, NULL ))
 927     {
 928         nts = STATUS_OBJECT_NAME_INVALID;
 929         goto out;
 930     }
 931
 932     attr.Length = sizeof(attr);
 933     attr.RootDirectory = 0;
 934     attr.Attributes = OBJ_CASE_INSENSITIVE;
 935     attr.ObjectName = &newdir;
 936     attr.SecurityDescriptor = NULL;
 937     attr.SecurityQualityOfService = NULL;
 938
 939     nts = NtOpenFile( &handle, FILE_TRAVERSE | SYNCHRONIZE, &attr, &io, FILE_SHARE_READ | FILE_SHARE_WRITE,
 940                       FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT );
 941     if (nts != STATUS_SUCCESS) goto out;
 942
 943     /* don't keep the directory handle open on removable media */
 944     if (!NtQueryVolumeInformationFile( handle, &io, &device_info,
 945                                        sizeof(device_info), FileFsDeviceInformation ) &&
 946         (device_info.Characteristics & FILE_REMOVABLE_MEDIA))
 947     {
 948         NtClose( handle );
 949         handle = 0;
 950     }
 951
 952     if (curdir->Handle) NtClose( curdir->Handle );
 953     curdir->Handle = handle;
 954
 955     /* append trailing \ if missing */
 956     size = newdir.Length / sizeof(WCHAR);
 957     ptr = newdir.Buffer;
 958     ptr += 4;  /* skip \??\ prefix */
 959     size -= 4;
 960     if (size && ptr[size - 1] != '\\') ptr[size++] = '\\';
 961
 962     /* convert \??\UNC\ path to \\ prefix */
 963     if (size >= 4 && !wcsnicmp(ptr, L"UNC\\", 4))
 964     {
 965         ptr += 2;
 966         size -= 2;
 967         *ptr = '\\';
 968     }
 969
 970     memcpy( curdir->DosPath.Buffer, ptr, size * sizeof(WCHAR));
 971     curdir->DosPath.Buffer[size] = 0;
 972     curdir->DosPath.Length = size * sizeof(WCHAR);
 973
 974     TRACE( "curdir now %s %p\n", debugstr_w(curdir->DosPath.Buffer), curdir->Handle );
 975
 976  out:
 977     RtlFreeUnicodeString( &newdir );
 978     RtlReleasePebLock();
 979     return nts;
 980 }